구매의사결정 지원을 위한 실시간 가격비교 Agent 개발

권효석,류정섭,조형래 경상대학교 생산기술연구소 2001 工學硏究院論文集 Vol.1 No.-

The proliferation of the internet and related applications has made users struggle with information overload. It means users must spend more time to find and gather necessary information they want. The agent technique is advocated by many researchers as an alternative to overcome the difficulty, which resulted in the practical use of the agent technique in Electronic Commerce more common. In this paper, we propose a realtime price comparison agent which compares the prices and services among online stores in realtime without users' intervention. The proposed agent differs from the existing ones in that (1) it does not incorporate a pre-installed price database, (2) it automatically monitors users' current status without any input from the users.

모더니즘 소설에 나타난 의식의 물질성 : 울프와 조이스를 중심으로

이효석 새한영어영문학회 2006 새한영어영문학 Vol.48 No.4

This is a study on the materiality of mind and body in the novels of Woolf and Joyce. The modern novelists and their characters, in the face of the most uncertain and fluid times, seem to be fully conscious of the interaction and interdependence between body and mind consisting of the subject. Both Plato and Aristotle insist that the body is apt to prevent the human subject from seeing the true essential, that is, idea. They set body or matter beneath the spirit, which can be found in Descartes whose philosophy has been criticized by many scholars for its fundamental dualism. Bergson disrupts traditional concepts of body and consciousness, and spirit and material. He regards the body as an important medium between consciousness and outer world. In this regard, Bergson is similar to Bakhtin. Bakhtin emphasizes the importance of the body as a hole intermediating between the outer world and human consciousness, asserting inevitable interrelationships between spirit and body, the subject and the other, etc. In addition to Virginia Woolf and James Joyce, the modern novelists, such as Henry James and Joseph Conrad, seek to analyze and to prove the consciousness of human subject. Especially, Woolf and Joyce probe it with the technique of stream of consciousness. In their works are characters whose dialogic consciousness develops and enlightens their selves through body and outer matter.

유한 요소법의 자동요소생성 프로그램에 관한 연구

박효근,김형석 순천향대학교 부설 산업기술연구소 2001 순천향 산업기술연구소논문집 Vol.7 No.1

If the geometry of the problem is not one of the simplest, it is very difficult and time comsuming to subdivide the domain into a huge number of triangles by hand-made in order to apply Finite Element Method to analysis model. This paper presents a two dimensional automatic mesh generation which can be easily applicable to electromagnetic problem of complex shape for the finite element method. We implemented an automatic mesh generator using Delaunay triangulation in the windows environments.

다양한 교정용 접착제의 표면거칠기와 표면에너지 요소 분석

안효범,안석준,남동석 대한치과교정학회 2006 대한치과교정학회지 Vol.36 No.5

치과용 재료의 표면특성은 세균 부착에 중요한 역할을 한다. 본 연구의 목적은 다섯 종류의 광중합 교정용 접착제(불소를 방출하지 않는 세 종류의 콤포지트 레진, 불소를 방출하는 콤포지트 레진 한 종류, 레진 변형 글래스아이오노머 시멘트 한 종류)의 표면특성을 평가하는 것이다. 표면거칠기는 공초점 레이저주사전자현미경을 이용하여 측정하였고, 접촉각과 표면에너지 요소는 sessile drop method를 이용하여 분석하였다. 본 연구의 결과 교정용 접착제간 표면거칠기는 각 재료간 표면거칠기 차이가 0.05 ㎛ 이하로 상대적으로 적지만 각 재료 사이에 유의성 있는 차이를 보였다. Transbond XT와 Enlight는 Monolok2와 Lightbond 보다 유의하게 덜 거칠었다. 접촉각과 표면에너지 구성성분은 접착제 사이에 유의성 있는 큰 차이를 보였는데 특히 레진 변형 글래스아이오노머와 콤포지트 레진 접착제 간에 접촉각과 표면에너지에서 커다란 차이를 보였다. 레진 변형 글래스아이오노머의 경우 콤포지트 레진 접착제에 비해 유의하게 작은 접촉각과 높은 표면에너지를 보였으며 콤포지트 레진 접착제보다 강한 극성, 특히 강한 염기성 경향을 보였다, 본 연구는 레진 변형 글래스아이오노머가 콤포지트 레진 접착제에 비해 세균 부착에 유리한 환경을 제공한다는 것을 보여주었다. Objective: Surface characteristics of dental materials play an important role in bacterial adhesion. The purpose of this study was to investigate surface characteristics of 5 different light-cured orthodontic adhesives (1 fluoride-releasing composite, 3 non-fluoride-releasing composites, and 1 resin-modified glass ionomer). Methods: Surface roughness was measured using a confocal laser scanning microscope. Contact angle and surface free energy components were analyzed using the sessile drop method. Results: Surface roughness was significantly different between adhesives despite a relatively small variation (less than 0.05 ㎛). Lightbond and Monolok2 were rougher than Enlight and Transbond XT. There were also significant differences in contact angles and surface free energy components between adhesives. In particular, considerable differences in contact angles and surface free energy components were found between resin modified glass ionomer and the composites. Resin modified glass ionomer showed significantly smaller contact angles in 3 different probe liquids and had higher total surface free energy and stronger polarity, with notably stronger basic property than the composites. Conclusion: Resin modified glass ionomer may provide a more favourable environment for bacterial adhesion than composite adhesives.

고분자압출성형용 Single-Screw에 관한 열유동 기초연구

정효희,김재열,고명석,최승현,심재기,한재호 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-

Extrusion Screw, point parts of extrusion molding extruder, is expanded widely use area with construction machinery, site conveyance device food processor, medicine as well as Polymer extrusion forming. Because this can expect large quantity demand about Screw of special quality of extrusion Screw item, is become processing industry that adopt all kinds of small quantity production type. Accordingly, analysis by extrusion screw is also consisting of several directions. Extrusion screw differentia is appeared much at material selection of screw itself and each screw design as parts that cause a lot of high temperature and high tension and attrition among processing of product and use purpose and that should do it so that working conditions back according to kind of used balance may optimize of each Screw are desirable. In this treatise, analyzed and analyze single-screw that is using developing in Human Resource Training Project for regional Innovation subject considering pressure, temperature etc.. of extrusion screw using CFdesign that is 3 dimensional analysis program.

도로판형교의 Life-Cycle Cost 최적설계

조효남,민대홍,조준석 漢陽大學校 工學技術硏究所 2000 工學技術論文集 Vol.9 No.1

본 연구에서는 강판형교에 대하여 총기대비용을 최소화하는 최적설계모델을 제안하였다. 총기대비용은 전체 공용기간을 고려하여 초기비용(설계비용, 개통전 검증재하시험비용, 건설비용), 유지보수비용 및 기대파괴비용을 포함하고 있다. 설계변수들에 대해 총기대비용을 최소화하는 문제로 정식화하였고, 거동제약조건은 휨파괴와 전단파괴의 형태로 되어 있다. 이러한 총기대비용 최적설계를 수행함으로써 효율적이고 합리적인 비용산정을 통해 총기대비용 설계의 근거를 제시하고 구조물 총기대비용에 관한 민감도 분석을 하였다. 수치해석을 통해 본 연구에서 제안된 총기대비용에 근거한 강판형교의 최적설계가 기존 초기비용 설계에 비해 훨씬 합리적이고 경제적인 설계가 될 것이며 향후 구조물 설계에서 추구해 나가야 할 차세대 성능기준 설계와 매우 밀접한 설계법임을 알 수 있다. This paper presents an optimum design model for minimizing the life-cycle cost (LCC) of steel plate girder bridges. The point is that it takes into account service life process as a whole, and thus the life-cycle costs include initial (design, testing, and construction) costs, maintenance costs and expected failure costs. The problem is formulated as that of minimization of expected total life-cycle cost with respect to the design variables. The performance constraints are considered in the form of flexural failure and shear failure. By processing the optimum LCC design the effective and rational basis is proposed for calculating the total LCC and the sensitivity analysis of LCC is performed. Based on a numerical example, it may be positively stated that the optimum LCC design of steel plate girder bridges proposed in this study provides a lot more rational and economical design, and thus the proposed approach will expedite the development of new concepts and design methodologies that may have important implications in the next generation performance-based design codes and standards.

增資所得控除制度의 財務構造改善 效果分析

洪孝錫,金東勳 진주산업대학교 1996 論文集 Vol.35 No.-

The Income Deduction Systems from Capital Increase in Korea is a tax system regulated in the Regulation Law on Tax Reduction and Exemption for the improvement of firm's financial structure. The effectiveness of this system should be tested because the system distorts the impartiality and neutrality principle of taxation. The purpose of this study is theoretically and empirically to investigate the effectiveness of the Income Deduction Systems from Capital Increase for improving the financial structure of firms in Korean tax systems. In order to bring about this purpose, this study has reviewed the related Regulation Law on Tax Reduction and Exemption and the results of previous studies on the Income Deduction Systems from Capital Increase. It was proved that the Income Deduction Systems from Capital Increase have had significant effects on the improvement of firm's financial structure. Therefore, the Income Deduction Systems from Capital Increase ought to be enforced to induce capital increase. The findings, however, should be interpreted with caution, because this study has several limitations in measurement of the Income Deduction Systems from Capital Increase and sampling. Further research studies are needed with more refined method.

지지력 실험을 통한 지반강도정수의 추정에 관한 연구

송무효,홍석우 동의대학교 산업기술개발연구소 2001 産業技術硏究誌 Vol.15 No.-

기존의 얕은 기초의 지지력 이론은 지반이 동시파괴(전반전단파괴)를 일으킨다는 강소성을전제로 하고 있으며, 이론식 속의 지지력 계수(Nc, Nr, Nq)는 단지 지반의 내부마찰각(φ)만의 함수로 표현되어져 있다. 따라서 파괴의 진행성, 또는 재하폭에 따른 영향이 명확히 고려되어져 있지 않다. 이에 본 논문에서는 주문진사를 이용하여 중간·조밀의 모래지반을 성형하곡 재하폭(B)을 변화시켜 실험하였다. 실험결과로부터 조밀한 모래지반에서도 진행성 파괴(Progressive Failure)와 크기 효과(Scale Effect)가 나타남을 알 수 있었다. 본 연구에서는 이들 영향을 고려하기 위하여 이론과 실험에 의한 Nr의 비를 지지력계수비(Rr)라고 정의하였고, 모래지반의 내부마찰각을 추정하는 방법을 제안하였다. The theoretical bearing capacity equation of shallow foundation has been proposed under the state of a general shear failure and by using the rigid plastic theory. The bearing capacity factors(Nc, Nr, Nq) of theoretical equation are also decided by internal friction angle(φ) only of ground. Therefore, the effect of progressive failure and loading width are not considered in it. In this paper, the laboratory model tests are performed for medium and dense Joomunjin standard sand with variation of width of loading plate. From test results, the effect of progressive failure and loading width are analyzed. And, the ratio of bearing capacity factor(Rr) is defined, which can be calculated using theoretical value of Nr and experimental value(Nr') of Nr. By using ratio of bearing capacity factor(Rr), the internal friction angle of sand ground can be obtained from test results of bearing capacity.

사회환경교육의 교육과정 표준화 모형 및 통합프로그램 개발연구

박석순,최돈형,성효현,허명,강명희,이숙임,남상준 이화여자대학교 환경문제연구소 1998 이화환경연구 Vol.2 No.-

This paper presents the development of standardized modules and an integrated program which will be used for social environmental education. The study objectives are to develop modules which are based on various environmental topics, to relate the regional environmental topics to the educational modules and program, and to include the demand of students in the modules and program. Literature and questionary surveys, as well as, module development method were utilized as research tools. The titles of developed modules are "The Green Plant Earth," "Unexpected Resources: Save Resources and Recycle", "Water as the Mother of All Lives", "The Blue Sky with Clean Air", and "Soil as the Home of All Living and Non-living Things". It is hoped that the developed modules and program are utilized as course materials and curriculum for social environmental education in various educational institutes. The study results will be materialized as multimedia in near futher.

체중감량 프로그램에 따른 체력의 변화에 대한 연구 : by Obese Female College Students in Seoul

박효정,장도석,장은재 동덕여자대학교 2003 생활과학연구 Vol.8 No.-

The purpose of this study was to investigate the effect of the aerobic exercise with calorie restricted diet on the change of the body composition, health-related fitness and performance-related fitness during 4 weeks. Twelve obese female college students ages from 20 to 24 who participated in this program. Variables were body composition; Fat mass, Fat free mass. Fat percentage, PIBW(Percentage of ideal Body Weight), BMI(Body Mass Index), health-related fitness and performance-related fitness. The results were as following; First. Diet was found to have a significant decrease of 266㎉ in the change of energy intake and exercise was found to have a significant consume of 309.71㎉ in the change of energy expenditure. Second, Weight, BMI, PIBW, percent body fat, fat mass were found to have a significant decrease of 5.02%, 5.01%, 5.25%, 2.58%, and 2.61% in the change of the body composition, respectively. (P>0.05) FFM was also decreased but it was not significantly. Third, Grip strength and Sit-ups were found to have a significant increase of 2.69% and 2.78% in the change of health-related fitness. (P>0.05) Back strength, Sitting trunk flexion and VO2max were found to have increase of 1.47%, 0.35% and 0.75% in the change of health-related fitness. Forth, Whole body reaction time was found to have a significant decrease of 2.62% in the change of performance-related fitness. Vertical jump and Closed eyes-foot balance were found to have a increase of 1.96% and 1.79% in the change of performance-related fitness. As the results, the weight control program demonstrated to have a positive effect in the improvement of the body composition, health-related fitness and performance-related fitness in obese female.